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פותח על ידי קלירמאש פתרונות בע"מ -
Preovulatory follicular status and diet affect the insulin and glucose content of follicles in high-yielding dairy cows
Year:
2000
Source of publication :
Animal Reproduction Science
Authors :
בור, אמיר
;
.
בראב-טל, רות
;
.
ברוקנטל, ישראל
;
.
לנדאו, יאן
;
.
קאים, משה
;
.
Volume :
64
Co-Authors:
Landau, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Braw-Tal, R., Department of Animal Reproduction, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Kaim, M., Department of Animal Reproduction, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Bor, A., Department of Animal Reproduction, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Bruckental, I., Department of Cattle Nutrition and Physiology, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
181
To page:
197
(
Total pages:
17
)
Abstract:
Insulin and glucose may be limiting factors for ovarian function in dairy cows genetically selected for high milk yield. The effects of nutrition on the intrafollicular content of insulin and glucose were investigated in Israeli Holstein dairy cattle fed a basic total mixed ration and producing 34-39 kg of milk daily. In experiment 1, carried out in 11 oestrus-synchronised cows, little variation in insulin concentration was found in plasma sampled during the luteal phase, but high variation was found in plasma sampled during the follicular phase. Therefore, in order to prevent confounding the effects of diet and of phase in cycle in the following experiments, experimental diets were fed during the luteal phase of synchronised oestrus cycles. In experiment 2, designed as Latin-Square, six cows received sequentially diets containing 17.1 (control) or 19.7% of crude protein, using two sources of supplementary protein, i.e. soyabean meal (SBM) and corn gluten meal (CGM), differing in ruminal degradability and leucine content. When dry matter intake was used as covariant, plasma insulin on day 16 was 29.5 and 26.4% higher in cows fed diets containing SBM and CGM than in the control (P < 0.05). In experiment 3, 17 cows were individually fed the basic diet and then switched to isoenergetic diets containing SBM (n = 5), CGM (n = 6) or corn grain (CG, n = 6) given from day 10 to 16 of the synchronised oestrus cycle. On the eve of day 16, and in the morning of day 17, they were administered PGF2α and the content of 26 largest follicles was aspirated by using the transvaginal ovum pick-up technique. Follicles were sorted into two classes (preovulatory and subordinate) according to oestradiol concentration and the progesterone:oestradiol ratio in follicular fluid (FF). Higher concentrations of insulin (0.282 versus 0.127 ng/ml, P < 0.0001) and of glucose (0.614 versus 0.386 g/l, P < 0.002), were found in FF from preovulatory follicles. The insulin concentration in the FF of cows fed the CG diet was 26% higher than in their counterparts fed CGM (P < 0.04), SBM being intermediate. Dietary effects did not reach significance in subordinate follicles. The finding that preovulatory follicular status is associated with increased intrafollicular insulin and glucose suggests that insulin is involved in follicular maturation. The nutritional effect on intrafollicular glucose and insulin may have practical implications to optimise feeding in dairy cows during phases of the oestrus cycle. © 2000 Elsevier Science B.V.
Note:
Related Files :
Animal
Blood
cattle
Estrus Synchronization
Female
Glycine max
metabolism
milk
nutrition
progesterone
Zea mays
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/S0378-4320(00)00212-8
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
29608
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:48
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Scientific Publication
Preovulatory follicular status and diet affect the insulin and glucose content of follicles in high-yielding dairy cows
64
Landau, S., Department of Natural Resources, Institute of Field and Garden Crops, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Braw-Tal, R., Department of Animal Reproduction, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Kaim, M., Department of Animal Reproduction, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Bor, A., Department of Animal Reproduction, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Bruckental, I., Department of Cattle Nutrition and Physiology, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Preovulatory follicular status and diet affect the insulin and glucose content of follicles in high-yielding dairy cows
Insulin and glucose may be limiting factors for ovarian function in dairy cows genetically selected for high milk yield. The effects of nutrition on the intrafollicular content of insulin and glucose were investigated in Israeli Holstein dairy cattle fed a basic total mixed ration and producing 34-39 kg of milk daily. In experiment 1, carried out in 11 oestrus-synchronised cows, little variation in insulin concentration was found in plasma sampled during the luteal phase, but high variation was found in plasma sampled during the follicular phase. Therefore, in order to prevent confounding the effects of diet and of phase in cycle in the following experiments, experimental diets were fed during the luteal phase of synchronised oestrus cycles. In experiment 2, designed as Latin-Square, six cows received sequentially diets containing 17.1 (control) or 19.7% of crude protein, using two sources of supplementary protein, i.e. soyabean meal (SBM) and corn gluten meal (CGM), differing in ruminal degradability and leucine content. When dry matter intake was used as covariant, plasma insulin on day 16 was 29.5 and 26.4% higher in cows fed diets containing SBM and CGM than in the control (P < 0.05). In experiment 3, 17 cows were individually fed the basic diet and then switched to isoenergetic diets containing SBM (n = 5), CGM (n = 6) or corn grain (CG, n = 6) given from day 10 to 16 of the synchronised oestrus cycle. On the eve of day 16, and in the morning of day 17, they were administered PGF2α and the content of 26 largest follicles was aspirated by using the transvaginal ovum pick-up technique. Follicles were sorted into two classes (preovulatory and subordinate) according to oestradiol concentration and the progesterone:oestradiol ratio in follicular fluid (FF). Higher concentrations of insulin (0.282 versus 0.127 ng/ml, P < 0.0001) and of glucose (0.614 versus 0.386 g/l, P < 0.002), were found in FF from preovulatory follicles. The insulin concentration in the FF of cows fed the CG diet was 26% higher than in their counterparts fed CGM (P < 0.04), SBM being intermediate. Dietary effects did not reach significance in subordinate follicles. The finding that preovulatory follicular status is associated with increased intrafollicular insulin and glucose suggests that insulin is involved in follicular maturation. The nutritional effect on intrafollicular glucose and insulin may have practical implications to optimise feeding in dairy cows during phases of the oestrus cycle. © 2000 Elsevier Science B.V.
Scientific Publication
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